How to add a cross-vlan device

If it’s a Ruida controller, the Ethernet interface cannot handle anything other than a simple /24 network with all devices in that subnetwork.

Some previous discussions provide background:

Apparently it’s possible to use a router to bridge between the complex network and the Ruida controller, with the router handling all the fancy vlan addressing and providing the controller with a simple /24 subnet.

The LightBurn Bridge works between WiFI and a Ruida controller, so the firmware may be of some use: